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Outboard motor

a technology for outboard motors and motors, applied in the direction of combustion engines, combustion air/fuel air treatment, charge feed systems, etc., can solve the problems of not providing the optimum engine control suitable for the respective right and left cylinders, and achieve the effect of optimizing the engine performance of a v-type engine and simple structur

Inactive Publication Date: 2008-10-28
YAMAHA MARINE KK
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Accordingly, there is a need in the art for a simple structure and method that can optimize engine performance of a V-type engine by changing effective lengths of right and left side intake conduits.
[0008]The present invention is made in view of the conventional problem discussed above, and an object of one embodiment is to provide an outboard motor that can make the optimum engine control suitable for respective right and left cylinders by individually changing effective lengths of a right and left pair of intake conduits, with a simple structure.

Problems solved by technology

Thus, the control of the effective lengths of the respective intake conduits for the cylinders of the right and left banks may be varied simultaneously and may not provide the optimum engine control suitable for the respective right and left cylinders.

Method used

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Embodiment Construction

[0025]The present specification is provided in the context of a preferred embodiment of an outboard motor, which preferred embodiment is not intended to limit the scope of this invention. In this embodiment, a front side of the outboard motor is positioned on a hull side of an associated watercraft, while a rear side of the outboard motor is positioned on the opposite side to the hull side.

[0026]With initial reference to FIG. 1, the outboard motor 1 has a propulsion unit 2 whose housing part is formed with a cowling 3, an upper casing 4 and a lower casing 5. The cowling 3 positioned atop encloses an engine 10 whose crankshaft 10a extends generally vertically, while the lower casing positioned on the bottom has a propeller 6 rotated by the power of the engine 10. In the engine 10, the crankshaft 10a is positioned closer to the hull of an associated watercraft than cylinders 10b which are located on the side of the crankshaft 10a opposite the hull. A power transmission mechanism 11, e...

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Abstract

An outboard motor mounted to a hull of a watercraft includes a V-type engine having right and left cylinder banks positioned in a cowling and having a crankshaft generally vertically disposed when the watercraft is under a running condition. A surge tank is disposed in the cowling. Right and left side long intake conduits and right and left side short intake conduits both connect the surge tank to intake ports of respective right and left banks of cylinders. The associated long intake conduits and short intake conduits can be selectively established depending on information about operational conditions of the hull and / or the outboard motor. The outboard motor includes right and left shut-off valves interchanging the long intake conduits and the short intake conduits. Right and left actuators individually actuate the right and left shut-off valves in accordance with information about operational conditions. A control means individually controls operations of the respective actuators.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based on and claims priority to Japanese patent application Serial No. 2006-114831, which was filed on Apr. 18, 2006, the entirety of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to an outboard motor having an engine having intake conduits, more specifically, the present invention relates to an outboard with an engine in which a length of each intake conduit is variable.[0004]2. Description of the Related Art[0005]Outboard motors are typically mounted on a hull of a watercraft and include an engine disposed within a cowling of the motor such that a crankshaft of the engine extends generally vertically when the watercraft is under a running condition. For some engines, an effective length of each engine air intake conduit can be varied in accordance with an engine speed so as to, for example, obtain the inertia charge effect of air intak...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F02M35/10F02M35/104F02M35/108F02M35/116
CPCF02B27/0284F02M35/10052F02M35/10072F02M35/108F02M35/116F02M35/167Y02T10/146F02B27/0215F02B27/0273F02B27/0294Y02T10/12
Inventor OSAKABE, TAKAYUKIIWATA, YOSHIBUMI
Owner YAMAHA MARINE KK
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